Player rating for tournaments across all installments of Heroes.

to AmberSoler: based on everything mentioned above, it follows that calculating the player rating based on the position occupied in a tournament is the most accurate and correct approach! :D
because it is better decoupled compared to the rating based on the blitz rating.
that is, it best fulfills point #4

4. Blitz does not carry any points of the overall rating - they cannot be compared (!), these are just Arabic numerals that should be considered only as a criterion for the mutual arrangement of players on the rating scale. This is a dimensionless quantity.